.box{
    width: 515px;
    height: 200px;
    background-color: red;
    display:block ;
}
.box-hidden{
    display: none;
}
.hover{
    display: flex;
    justify-content: space-between;
    background-color: skyblue;
}
.btn-show{
    display: block;
}
.btn-hide{
    display: none;
}
.input{
    width: 400px;
    height: 25px;
    border-radius: 8px; 
    border: 3px solid blue;
    padding: 5px;
}
.top{
    background-color: blue;
    border-radius: 8px;
}
.btn{
    width: 100px;
    background-color: blue;
    border: none;
    color: white;
    font-weight: 600;
    font-size: 20px;
}